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(No Model.) 3 Sheets-Sheet I.

P. HUBER.

ENGINE FOR PREPARING PAPER PULP.

No. 535,205. Patented a1". 5-, 1895.

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(No Model.)

P. HUBER. ENGINE FOR PREPARING PAPER PULP.

Patented Mar. 5, 1895.

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P. HUBER. ENGINE FOR PEEPARING PAPER PULP.

No 535,205. Patented Mar. 5, 1895.

'(Uiheww: V Inventor:

NETED STATES PATENT Fierce,

ENGINE FOR PREPARING PAPER-PULP,

SPECIFICATION forming part of Letters Patent No. 535,205, dated March 5, 1895. Application filed August 30, 1894. Serial No. 521,672. (No model.) Patented in Switzerland June 3, 1892, No. 5,216 in Germany June 8, 1892, No. 67,720: in France October 13, 58,564 and'llo- 86,526.

To aZZ whom it may concern-.-

Be it known that I, PHILIPP HUBER, a citizen of the Republic of Switzerland, residing at Ravensburg, in the Kingdom of Wiirtemberg, Germany, have invented a certain new and useful Engine for Preparing Paper-P ulp, (for which I have obtained patents in Switzerland, No. 5,216, dated June 3, 1892; in Germany, No. 67,720, dated June 8, 1892; in France, No. 224,920, dated October 13, 1892, and in Austria-Hungary, Reg. No. 58,564 and No. 86,526, dated March 25, 1893,) of which the following is a specification.

My invention has reference to an improved rag engine for beating rags into pulp, and it consists of a rag engine for making paperpulp, which comprises a vat, of the general shape of the figure 8, and having inwardly-projecting contractions on its median line, a beater-roll, the shaft of which is located in the longitudinal axis of the vat, bed-plate knives located below the vat parallel with the axis of the same, a central inclined portion in the bottom of the vat extending transversely from oneinwardly-projecting contraction toward the bed-plate knives, a concentric portion near the opposite contraction of the vat, which diminishes in width toward the upper end and terminates in a transverse apex in line with said contraction, and inclined channels extending from said apex in opposite directions toward the central incline in front of the beater-roll, as will fully appear hereinafter and finally be pointed out in the claims.

By the construction described the liquid and fibrous material is moved by the beaterrollover the bed-plate knives and lifted along the concentric portion in order that the pulp forced over the inclined edges and apex of the central contraction directly back of the beater-roll is separated into rightand lefthand currents, and returned in opposite directions around the beater-roll and united again immediately in front of the same, which arrangement results in a greater productive capacity as compared with the rag-engines of the same dimensions of known types, so that a considerable economy of space and a reduction in the running expenses of the engine are obtained.

1892, No. 224,920, and in Austria-Hungary March 25, 1893, No.

As contradistinguished from the construction of rag-engines heretofore in use, in which the pulp is made to flow in one direction for a certain distance and is then moved in backward direction, my improved ra -engine has the characteristics that the pulp is thrown directly back of the beater-roll against a concentric and tapering portion of the vat and then divided with considerable force and mixed as it passes over the inclined edges of the concentric portion, as the larger or smaller particles move in opposite direction, partly by their dilference in weight and partly by the various angles at which they are shed over the inclined sections of the concentric portion so that special mixing-devices can be dispensed with, while also the formation of lumps is entirely prevented.

My improved construction further enables the employment of a very wide beater-roll in combination with a comparatively small vat. If, for instance, the diameter of the beaterroll be twelve hundred millimeters and its width fourteen hundred millimeters, then a rag-engine of any of the constructions heretofore in use, would require a vat of the following dimensions: six thousand five hundred millimeters clear length, three thousand nine hundred clear width, six thousand seven hundred millimeters exterior length, four thousand one hundred millimeters exterior width, while the vat of my improved rag-engine would require only the following dimensions: four thousand four hundred millimeters clear length, two thousand six hundred millimeters clear width, five thousand millimeters exterior length, and two thousand seven hundred and fifty millimeters exterior width.

My improved beater-roll is furthermore distinguished by a very simple construction, which permits the accurate and less expensive manufacture of the same inasmuch as the ribs for holding the beating-knives are inserted into the roll and not cast into the same '95 as formerly. This permits the surface on which the beating-knives are mounted to be exactly and easily turned off to the required size.

In the accompanying drawings, Figure 1 represents a vertical longitudinal section of my improved rag-engine. Fig. 2 is a plan of the same, partly in section. Fig. 3 is a vertical transverse section on line 00, 00, Figs. 1 and 2, and Fig. 4 is an end-elevation of the same.

Similar letters of reference indicate corresponding parts.

Referring to the drawings, a represents the vat of my improved rag-engine, which is made in its general outlines in the shape of the figure 8, whereby two inwardly-projecting portions or contractions a a are formed at the transverse median line of the vat, which confractions together with the nearly circular channels a a which are located at the right and left-hand sides of the contractions, compose the vat proper. The shaft b of the beaterroll 0 is supported in bearingsb b of the vat, and located in line with the longitudinal axis of the vat, whereby a considerable distance between the bearings is obtained, which, however, is not objectionable, as rag-engines ofv large size have heretofore been built with a similar distance between the shaft-bearings .of the beater-roll.

It appears from Figs. 2 and 3 that the channels a a gradually rise from the contraction a in front of the beater-roll to their highest point at the contraction a at the rear of the beater-roll, said channels terminating in a transverse apex a. that extends from the contraction a. to a central upwardly-curved portion 01, which is concentric with the beaterroll and located adjacent to the bed-plate knives dot the same. The bed-plate knives d are located parallel with the longitudinal axis of the vat below the beater-roll, and are composed of a number of knives which are supported in position by means of a body of cast zinc. By a corresponding change in the rear-contraction a, any other approved system of bed-plate knives could be used, such as the ordinary system heretofore in use, or that patented by J. P. Korschilgen, No. 268,086, dated Decornber 12, 1882, but whatever form of bed-plate is used, it is necessary to provide for the removal of the same from the vat by making a section f of the inner wall of the channels a a made removable for the purpose of permitting the taking out of the bed-plate which is drawn out longitudinally toward the inner wall of the channel a and lifted by its outer end upwardly, being then drawn through the recess formed by removing the section f. This is shown at the right-hand side of Figs. 1 and 2 at the inner wall of the channel a. The beater-roll 0 consists of three annularly flanged disks f,f',f arranged on the shaft Z) and each provided with transverse circumferential grooves c which are produced equidistantly from each other by casting or planing, and which serve when in alignment for receiving the small wooden wedges c Packing-strips c are arranged in the spaces between the wedges c and rest together with the knives on the cirtion on the beater-roll.

cumference of the beater-roll, the wedges c and the strips 0 holding the knives in posi- The wedges become slightly thicker from their inner toward their outer edges so as to firmly hold the knives and packing-strips in position by means of their thicker portions. To hold the wedges, strips and knives from outward displacement, the same are provided at their opposite ends with notches which receive the retainingrings 1' at each end of the beater-roll. This construction of thebeater-roll permits of the accurate turning up of the circumferences of the flanged disks so that the beating-knives rest on and extend uniformly from the circumferences of the disks.

The pulp is lifted by the beater-roll over the tapering concentric center-portion back of the beater-roll, and is broken up, as it passes over the highest point of the same at both sides of the apex of the transverse contraction a, so as to pass in opposite direction and in divided currents forward in the channels a a uniting in front of the beater-roll whence it is drawn up along the inclined portion in front of the same and over the bedplate knives, and lifted again over the concentrically-curved and tapering center-portion, and so on, whereby the pulp is always divided into equal bodies, which are effectively broken up, so that all the fibrous material in the same is thoroughly mixed, said currents uniting in front and being forced again over the bed-plate knives and over the concentric central portion at the rear-contraction, and so on, whereby the very efiective mixing and reducing of the pulp are obtained.

Having thus described my invention, I claim as new and desire to secure by Letters Patent- 1. In a rag-engine, the combination, with a vat made in the general shape of the figure 8, and provided with inwardly-extending proj ections or contractions at its transverse me dian line and with circular channels on both sides of the contractions, of a beater-roll, the shaft of which is supported in line with the longitudinal axis of the vat, bed-plate knives below the beater-roll, and a central tapering rear-wall concentric to the beater-roll and extending from the bed-plate knives to the apex of the rear-contraction, substantially as set forth.

2. In a rag-engine, the combination, with a vat made in the general shape of the figure 8,

and provided with central contractions and channels with inclined bottoms that rise from the lowest part at the front-contraction toward thehighest part at the rear-contraction, of a beater-roll, the axis of which is arranged in line with the longitudinal axis of the vat, and bed-plate knives below the same, substantially as set forth.

3. A rag-engine, comprising a vat made in the shape of the figure 8, a beater-roll mounted on a horizontal shaft in line with the longi- IIO tudinal axis of the vat, bed-plate knives arranged below the beater-roll parallel with the longitudinal axis of the vat, and a concentric rear-Wall at the middle portion of the vat, said curved bottom being made to taper toward the transverse apex of the rear-contraction of the vat so as to break up the pulp into two separate bodies and shed the same in opposite directions respectively into the right and left-hand channels of the vat, substan- IO tially as set forth.

Intestimony whereof I hereunto sign my name, in the presence of two subscribing Witnesses, this 10th day of July, 1894.

PHILIPP HUBER.

Witnesses:

H. LABHART, MoRITz VEITH. 

